What do we call a barrier that is built to control the flow of water in a river or stream?

What do we call a barrier that is built to control the flow of water in a river or stream?

• A. Dam
• B. Levee
• C. Jetty
• D. Canal

Answer: (A)

A barrier built to control the flow of water in a river or stream is referred to as a dam. Dams serve various purposes, including flood control, water supply for irrigation, hydroelectric power generation, and recreation. They are constructed across rivers to create reservoirs, which can store vast amounts of water and release it in a controlled manner, thereby managing river flow and helping to prevent downstream flooding.

For context, levees are embankments constructed alongside rivers to prevent overflow during floods but do not create storage like a dam does. Jetties are structures placed at river mouths or coastal areas to protect harbors or coastlines from wave action, and they don't control water flow within a river. Canals are artificial waterways used for navigation or irrigation and are not barriers on a river system. Overall, the unique function of a dam in controlling and managing water flow makes it the correct choice.